Re: [9front] Getting Started with Kernel Development?

[hiro <23hiro@gmail.com>]

here's a fitting solution

https://de.aliexpress.com/item/1005002220730177.html

i picked this one because it doesn't have a case,  just like the rpi.
of course the ones with case are a little cheaper, but this way you
can say you built it yourself

On 4/25/21, cinap_lenrek@felloff.net <cinap_lenrek@felloff.net> wrote:
>> I've also got the "BCM2835 ARM Peripherals" spec, which specifies how
>> to interact with the chip's I2S audio interface.
>
> As far as i know, the stock raspberry pi is not using I2S.
>
> There are some people that have build their own soundcards
> for the pi with a I2S DAC but it is not standard.
>
> Instead, they hacked together some filter circuit and connected
> it to a GPIO pin.
>
> (This pattern is a logical continuation on raspberry pi hardware
> design philosphy, where using the existing dedicated peripherals
> for their intended purpose must be rejected and standards must be
> ignored: cpu -> GPU, ethernet -> USB, audio -> GPIO, wifi -> SDCARD,
> usb -> ?????WHATISTHIS????, usbc -> ?????, PXE -> ???????).
>
> The GPU has firmware code to drive that GPIO pin and also send
> audio over HDMI, but todo that you have to talk to the videocore
> firmware thru a complicated software media streaming interface.
>
> Afik, it is possible to drive the gpio pin from the cpu somehow
> but quality will be garbage and waste alot of power.
>
> --
> cinap
>